Staking-machine



No. 623,423. Patented Apr. l8, I899.

H. M. PIERCE 81. W. E. PUINSETT.

STAKING MACHINE.

(Application filed Apr. 21, 1898.) (No Model.) 2 Sheets8heet l.

a/Lfnewes: fl f MC; yfi'erae/f J I fizez'r dame No. 623,423. PatentedApr. I8, I899. H. m. PIERCE & w. E. POINSETT.

STAKING MACHINE.

(Application filed Apr. 21, 1898.) 2 Sheets-Sheet 2.

\imsp M/Linessw NETED STATES PATENT @rricn.

HARRY M. PIERCE AND \VILLIAM E. POINSETT, OF WILMINGTON, DELAlVA-RE.

STAKlNG-MACHINE'.

SPECIFICATION forming part of Letters Patent No. 623,423, dated April18, 1899.

Application filed April 21, 1898. Serial No. 678,437. (No model.)

To ctZZ whom it may concern:

Be it known that we, HARRY M. PIERCE and WILLIAM E. POINSETT, citizensof the United States, residing at Wilmington, in the county of NewCastle and State of Delaware, have invented certain new and usefulImprovements in Staking-Machines; and we do hereby declare the followingto be a full, clear,

and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to staking-m achines.

The object is to obviate the employment of cams for opening and closingthe stakingjaws and in lieu thereof to provide mechanism which willoperate to insure positive and even pressure on the hide throughout theentire stroke of the jaws.

With this object in view the invention consists in the novelconstruction and combination of parts of a staking-machine, as will behereinafter fully described and claimed.

In the accompanying drawings, forming a part of the specification, andin which like letters and numerals of reference indicate correspondingparts, we have illustrated a form of embodiment of our invention, itbeing understood that other forms of embodiment thereof may be employedwithout departing from the spirit of the same.

In the drawings, Figure l is a view in plan. Fig. 2 is a viewin sideelevation. Fig. 3is a detail view in plan, showing more particu-.

larly the mechanism for operating the staking-jaws and also foradjusting the pressureroll. Fig. 4: is a view in side elevation, partlyin section, showing more clearly certain parts not seen in Fig. 3. Figs.5, 6, and 7 are detail views in elevation, respectively, of thepressure-roll, the knives, and pressure-pad;'

and Fig. 8 is a detail view in the nature of a diagram, on an enlargedscale, showing the successive planes presented by the wedge operatingthe staking-jaws through one complete reciprocation thereof.

Referring to the drawings, A is the frame comprising two memberssuitably bolted together to present a rigid structure. Mounted upon andsecured to this frame are two guides (L (b preferably circular incross-section, upon which reciprocate suitable bearings (i carried by across-head a. At one end of the framethe rear end in use-are mountedjournal-boxes, in which work two shafts a (t the former carryingdrive-pulleys a and the lattera balance-wheel a On the inner ends ofeach of these shafts is socured a bell-crank lever, comprising each along arm a and a short arm (L the short arm of each lever being set atan angle of about ninety degrees to the long arm, and connecting thelonger arms of these levers with the cross-head a are two rods a theconnection between the bell-crank lever and the rods beingin thisinstance through the medium of ordinary pins, such as are usuallyemployed. Passing through the shorter arms 04 is a crosspin, which holdsin place at that point one end of a rod (L12, the other end of which issecured to a wedge (L13, (clearly shown in Figs. 2 and 4 and in Fig. 8,)the said Wedge being held for reciprocating movement upon guides 0.firmly secured on the inside of the cross-head, as clearly shown in Fig.3. staking-jaw levers B B are f ulcrumed at points I) on the cross-heada, the fulcrums being located near the rear ends of these levers, so asto present a long and a short arm, the short arm being at the rear. Eachof these short arms carries an adjustable support 19 in each of which isjournaled a roller b adapted to bear, respectively, upon the upper andunder faces of the wedge (0 the rollers being always kept in closecontact with the wedge by two tension-springs 17 secured to the two armsl3 l3 and to the cross-head, as will be understood by reference to Figs.3 and 4t.

The

At the end of the long arm of the lever Bis mounted upon the lever B andin this instance comprise a straight and a curved knife, although asingle knife may be used, if preferred. The means for holding the knivesin operative position comprises a holder 17 secured to the ends of rodsI), carried by and adjustable in the end of the lever B As beforestated, this holder contains two knives, one curved and one straight.The curved knife b comes into contact with the roller b while thestraight knife 19 which is directly in front of the curved knife and atrifle above the same, does not come in contact with the roller, so thatproper space is presented between which the hide may be pinched. Back ofthe knives a short distance is a pressure-pad comprising two pieces ofmetal I), clamped to the rods Z7 and a third piece of metal 19",carrying a rectangular piece of fiber or steel 12". The top piece Z2 isseparated from the two bottom pieces I) by two springs b Fig. 7, and aredrawn down on these springs by screws, thereby effecting cushioning atthis point.

The staking-table C is bolted to the front of the machine, and at thefront of the stakingtable is secured a roller-pad c of any suitablesubstance to enable the operator to hold the skin being operated uponfirmlyin place while the knives are operating thereon.

In operation the cross-head is reciprocated by the long levers a androds a and the wedge is reciprocated by the short arms d of thebell-crank levers and the rod (L12, thus imparting to the cross-head andwedge varying velocities of a predetermined ratio. Thus when thecross-head is on a dead-center the wedge is traveling at its maximumspeed and closes the levers, and with them the stakingjaws, veryquickly. When the wedge is forced between the rolls b the knives androll are closed together 011 the front end of the staking-jaw levers,putting the requisite pressure on the hide, and as the wedge iswithdrawn in the operation of the machine the said levers areautomatically opened by the tension of the springs 19 By changing theposition of the wedge we can readily effect a change in the point ofopening and closing the jaws.

As stated in the beginning of the specification, it is the object ofthis invention to obviate the employment of cams for opening and closingthe staking-jaws. Most stakingmachines as now constructed employ thesecams for this purpose, and the result is that it is utterly impossibleto obtain a perfectly even pressure throughout the entire stroke of thestaking-knives, for the reason that if a mechanically-perfect cam isprovided for this purpose it will for a time operate with comparativesatisfaction, but as soon as the perimeter of the cam becomes worn therewill be an uneven pressure applied to the knives and roll, resulting incausing the knives to release their grip at one point and grip morefirmly at another point, thus leaving hard places on the leather anddestroying the grain of the same.

By reference'to Fig. 8 it will be seen how the wedge employed in thisinvention entirely obviates any possibility of an uneven operation ofthe knives, inasmuch as during the operation of the knives planeparallel surfaces are presented to the rollers which by contact with thewedge-surfaces close the jaws, the rollers operating as fulcrums uponwhich the staking-jaw levers rock. Referring to this figure, l ldesignate the planes on which the rollstravel when the levers are open;2 2, the planes upon which these rolls travel when the wedge entersgradually to close the jaws, and 3 3 the planes on which the rollstravel while the jaws are closed.

Thus the jaws are held open while the rolls travel on exactly parallelplanes, are gradually closed while the roll is traveling on divergentplanes of equal angles, and are closed while the rolls are traveling onplanes exactly parallel with each other, thus giving a perfectly uniformpressure throughout the en tire stroke of the knives.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent of. the United States, is

1. In a staking-machine, the combination with staking-jaw levers and awedge to close the levers, of means for reciprocating the levers and thewedge at varying velocities of a predetermined ratio, substantially asdescribed.

2. In a staking-machine, the combination with the staking-jaw levers, ofa wedge for closing the levers, and mechanism for reciprocatin g thestakin g-j aw levers and the wedge in planes parallel with each otherand at varying velocities of a predetermined ratio, substantially asdescribed.

3. In a staking-machine, the combination with the staking-jaw levers, ofa wedge movable in a plane parallel with the plane of movement of thelevers, and adapted to close the levers, means for reciprocating thestaking-jaw levers and the wedge at varying velocities of apredetermined ratio, and means operating automatically to open thelevers at predetermined times, substantially as described. w

4. In a staking-machine, the combination with a cross-head and a wedge,of means for reciprocating the cross-head and the wedge at varyingvelocities of a predetermined ratio, staking-jaw levers supported by thecrosshead and to be closed by the wedge,and springs for opening thelevers at the proper times, substantially as described.

5. In a staking-machine, the combination ICC IOR

l'IC

with a cross-head, stakingjaw levers fulcrumed thereon, and a wedgeadapted to close the levers, of bell-crank levers driven by suitablemechanism,and rods connecting the bell- V crank levers with thecross-head and with the wedge, substantially as described.

6. In a staking-machine, the combination of a reciprocatory cross-head,staking-jaw levers pivotally mounted thereon, adjustable supportscarried by the rear ends of the said levers, rollers carried by thesupports, a reeiproeatory Wedge adapted to bear against the rollers, andmeans for reciprocating the cross-head and the Wedge at varyingvelocities of a predetermined ratio, substantially as described.

7. In a staking-machine, the combination with the staking-jaw levers,one of which carries a roller and the other the scrapers or knives, of aWedge movable in a plane parallel With the plane of movement of thelevers, and adapted to close the levers, means for reciprocating thestaking-jaw levers and the Wedge at varying velocities of apredetermined ratio, and means operating, automatically, to open thelevers at predetermined times, substantially as described.

8. In a staking-machine, the combination with a cross-head, stakingjawlevers fulerumed thereon, a roller carried by one of the levers andscrapers or knives carried by the other lever, and a Wedge adapted toclose the levers, bell-crank levers driven by suitable mechanism, androds connecting the belloranl: levers with the cross-head and with theWedge, substantially as described.

0. In a staking-machine, the combination With staking-jaw levers, of aWedge to close the levers, the entering point of the Wedge beingcomparatively small and having its upper and lower sides arranged inparallel planes, the head of the Wedge being comparatively large andalso having its upper and lower sides arranged in parallel planes, andthe portion intermediate the end and the head being tapered, and meansfor reciprocating the levers and the Wedge at varying velocities of apredetermined ratio, substantially as described.

10. In a staking-machine, the combination of a reeiprocatory cross-head,staking-jaw levers pivotally mounted thereon, adjustable supportscarried by the rear ends of the said levers, rollers carried by thesupports, a reeiproeatory Wedge adapted to bear against the rollers, theentering point of the Wedge being comparatively small and having itsupper and lower sides arranged in parallel planes, the head of the Wedgebeing comparatively large and also having its upper and lower sidesarranged in parallel planes, and the portion intermediate the end andthe head being tapered, and means for reciprocating the cross-head andthe wedge at varying velocities of a predetermined ratio, substantiallyas described.

In testimony whereof We have hereunto set our hands in presence of twoWitnesses.

HARRY M. PIERCE. WILLIAM E. POINSETT. Witnesses:

LEIGHTON COLEMAN VAN TRUMP,

CHARLES G. RUPERT.

